using UnityEngine;
using Arena.Characters;

namespace Arena.UI
{
	/// <summary>
	/// Single entry point of the UI: connects the views to the player and switches screens.
	/// </summary>
	public class UiManager : MonoBehaviour
	{
		[System.Serializable]
		public struct References
		{
			[Tooltip("In-game screen: health, ammo.")]
			public GameObject Hud;
			public HealthView HealthView;
			public AmmoView AmmoView;
			public GameOverView GameOverView;
		}

		#region Fields

		[SerializeField] private References _references;

		private Player _player;

		#endregion

		#region Unity Lifecycle

		private void Start()
		{
			// Start: every Awake has run, so Player.Instance is set
			_player = Player.Instance;

			if (_player == null)
			{
				Debug.LogError("UiManager: no Player in the scene.");
				return;
			}

			_references.HealthView.Bind(_player.Health);
			_references.AmmoView.Bind(_player.Launcher);
			_player.Health.OnDied += HandlePlayerDied;

			_references.Hud.SetActive(true);
			_references.GameOverView.Hide();
		}

		private void OnDestroy()
		{
			if (_player != null)
				_player.Health.OnDied -= HandlePlayerDied;
		}

		#endregion

		#region Private Methods

		private void HandlePlayerDied()
		{
			_references.Hud.SetActive(false);
			_references.GameOverView.Show();
		}

		#endregion
	}
}